Add email templates for user notifications and account management

- Created a base email template (base.html) for consistent styling across all emails.
- Added moderation approval email template (moderation_approved.html) to notify users of approved submissions.
- Added moderation rejection email template (moderation_rejected.html) to inform users of required changes for their submissions.
- Created password reset email template (password_reset.html) for users requesting to reset their passwords.
- Developed a welcome email template (welcome.html) to greet new users and provide account details and tips for using ThrillWiki.

django/staticfiles/unfold/js/select2.init.js

@@ -0,0 +1,15 @@
+"use strict";
+{
+  const $ = django.jQuery;
+
+  $.fn.djangoCustomSelect2 = function () {
+    $.each(this, function (i, element) {
+      $(element).select2();
+    });
+    return this;
+  };
+
+  $(function () {
+    $(".admin-autocomplete").djangoCustomSelect2();
+  });
+}